You could be like the Daily Podunk Times here in this area. The sports EDITOR there will quote a coach like this:

"We just couldnt play worth a shit tonight. I saw more energy out of the two dogs fucking that I saw on my way to school today," said Coach Smith. "We just have to have more energy, or we'll get the hell beat out of us every week," Coach Smith said.

How 'bout in quotes? When a player says "I spent all summer working on my pass-rush moves with Coach Williams," is that capitalized?

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The way I interpret AP style is that the above instance is the only one in which you should capitalize "coach" -- when it's clearly used as a title (like Chief, Sgt., King) rather than a job description. That's why you never should capitalize "general manager," because no one has ever said, "Negotiations with General Manager Cashman are going well."